Process of manufacturing wall boards composed of rice hulls and plaster



Patented June 23,1927.

UNITED STATES- 'rsunneono NISEI, or 'roxYo-rmoArAN.

PATENT: OFFICE. v

raocnssor murac'ruame wan. noanns courosnn or men norms AND rnas'rnn.

No Drawing. Application iilcd September 4, 1925, Serial No. 54,548, and in Japan November 20, 1984.

This invention relates to a process of manufacturing wall-boards composed of ricehulls and plaster, and has for its object to rovide for light and in'ex ensive walloards which have such desira le properties as airiness, soundearrestin'g, heat-protecti'ng, &c. I

he process in accordance with the present invention is characterized by the fact that, after smashing every rice-hull into several slender pieces, the rice-hulls are mixed with plaster, plaster and lime, or plaster and cement, then the mixture being then pressed in a mould and di ed into water, and thereafter it is removetf romthe water, thus allowing it to dry.

The invention will be readily understood from the following detailed description.

The ricehull is covered with silicious sur- ;face havin numerous small projections thereon, an is light, stifi', less combustible, less corruptible, non-heat-conductin and nearly unaffected under dryness an wetness.

It is already known that the wall-board composed of such rice-hulls and plaster, which latter is a good binding materlal, has many desirable properties such as airiness, sound-arresting, hea-t-protecti-n Heretofore, according to the ess of manufacturin rice-hulls in the ordi g, &c-. 1 nown procsuch wall-boards, the nary state have been mixed with plaster and water, and then themixture has been pressed under pressure to be formed. But in this process there is a great drawback which is to limit the quantity of rice-hulls in .the product to a small extent owin to the difliculty in setting, said product lac ing considerably mentioned desirable properties.

By the process in. accordance with the present invention suchv drawback is entirely removed and a more desirable-product can be obtained.

In the first operation of said process every rice-hull is smashed. into several slender, pieces, this operation being very important. The rice-hull is of hollow, capsule form and when in their original state cannot be combined with plaster .or, other materials in the strength of the product.

in the above sufficient quantities to'produce the desired result. On the other hand, b breaking up the hulls into small pieces a arge quantity of the hulls may be employed with the plastic material used. I

After .this 0 oration said smashed ricehulls arerid o impurities.

In the next operation the smashed ricehulls are mixed with plaster, plaster and lime, or plaster and cement in ,a suitable proportion, without adding water, which proportion in weight is given by way of example as follows;

(1) Rice-hulls, 4; and plaster, 9; (2) ricehulls, 2; plaster, 4; and lime, 1; (3) ricehulls, 8; plaster 12; and cement, 15, where lime or cement is used in order to inoreasp The mixture is brought into a mould which may be of any desired shape, and pressed under suitable pressure. Then the pressed mixture in the mould being dipped into water and after five to twenty minutes it is withdrawn from water and left to dry and become set.

Thus the required Wall-board is produced.

If' the product is coated with a solution,

of'silicate of soda or ammonia borate, waterproof wall-board will be obtained. And moreover, if iron reinforcement is placed within the mixture during the operation of fillin it in a mould, a very strong product will slab.

It is of course to be understood that the present invention described above may be modified in various manners without de-- partin from the scope of the invention.

Having thusfully described my invention, I claim as new and desire to secure by Letters Patent I 1.-The process of manufacturing wallboards composed of rice hulls and plaster in which, after crushing the rice hulls into slender pieces, the same are mixed with laster, the mixture then' being pressed in a mould and thereafter dipped in water.

2. The process of manufacturing wallboards composed of rice hulls and plaster r in which, after crushing the. rice hullsinto obtained and it may be used as'fioor slender pieces, the same are mixed with slender pieces, the same are mixed with plaster and lime, the mixture then being plaster and cement, the mixture then being pressed in a mould and thereafter dippedin pressed in a mould and thereafter dipped in 10 water. water.

' l. 3. The process: of manufacturing wal1- In testimony whereof I have affixed my boards composed of rice hulls and plaster in signature.

which, after crushing the rice hulls into v v TSUNEGORO NISHI. 

